[These five vrttis are] right knowledge, error, imagination, sleep, and memory
Pramana-viparyaya-vikalpa-nidra-smrtayah (in Sanskrit)
The Yoga Sutras - Chapter 1, Sutra #6
Patanjali enumerates five types of “vrttis” or changing states of mind here in Sutra #6. What happens is these five changing states bind our pure consciousness to the world of “samsara” (the cycle of birth and death). Our mind always finds itself in the right knowledge, error, imagination, sleep, or memory - the charging states of the mind that are either detrimental or nondetrimental to the practice of yoga. The Yoga tradition states that all possible mental states that we can experience in our lives, are manifestations of these five types of “vrttis”. Each of them is described in detail in the following Yoga Sutras.
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